Calculating apparatus.



No. 66l,096. Patented Nuv. 6, I900. F. A. WILKINSON & C. C. GIBSON.

CALCULATING APPARATUS.

2 SheetsSheet 2.

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wn/m'fzm I L I UNITED STATES PATENT OFFICE.

FRANCIS ALAN WILKINSON, OF MANCHESTER, AND CLAUD CAREW GIBSON,

' OF LONDON, ENGLAND.

CALCULATING APPARATUS.

SPECIFICATION forming part of Letters Patent No. 661.096, dated November 6, 1900.

Application filed March 15, 1900. :erial No. 8,804. \No model.)

To ctZZ- whom it may concern:

Be it known that we, FRANCIS ALAN WIL- KINSON, residing at Manchester, in the county of Lancaster, and OLAUD CAREW GIBSON, re-

siding at London, in the county of Middlesex,

England, subjects of the Queenot Great Britain, have invented a new and Improved Calculating Apparatus, (for which we have obtained provisional protection in Great Britain,

No. 17,306, hearing date August 26, 1899,) of

which the following is a specification.

The improvements relate to calculating mechanism, and have for their object to provide apparatus of a simple and convenient 5 character which shall be capable of successively indicating a number of figures at the will of the operator and at the same time of automatically indicating the sum or net total thereofin manner hereinafter to be described.

To accomplish this and to carry out our improvements we provide a suitable casing, by preference in the form of a watehcase and of a readily portable character, provided with a simple oritem-indicating dial or dials, and

with a result-indicating dial or dials, each dial being suitably divided and marked, and also provided with a pointer or pointers. The pointers are mounted in connection with gearing of any desirable character in such manner that on the movement of an actuating device they are simultaneously operated, but means are provided to enable one set of pointers to be moved independently of the other set when required for adjustment pur- 5 poses.

The accompanyingdrawings show one form of our invention adapted to the calculation of amounts in British coinage only, although the improvements are equally applicable to dif- 0 ferent subjects, such as measures of length or the like, whether alone or in addition.

Figure 1 shows a side internal view of apparatus formed in accordance with our improvements and on a larger scale than is in- 5 tended for convenient use, while Fig. 2 shows a part of the same view on a still larger scale. Fig. 3 shows a front View, partly in elevation and partly internal, of the apparatus, taken at right angles to Fig. 1; and Fig. 4c shows a detailed view of certain parts to be hereinafter described.

The same letters indicate corresponding parts wherever they occur.

a is the outer casing of the apparatus.

1) b are outer plates, and c c are inner plates, serving to support various parts of the constrnction, b I) being also employed as dialplates Two shafts d c are mounted to turn in the plates aforesaid, dcarrying an attached bevel-wheel f, gearing permanently into a second bevel-wheel g upon the spindle 71 connected to the cap 7;, which cap is capable of being turned by hand. Upon the shaft (2 a third bevel-wheel 7a is mounted, so as to be capable of sliding upon a key e in order to be brought into gear with the bevel-wheel g. The necessary actuation to effect this clutch movement is accomplished in the example shown by means of a spindle l, projecting through to the exterior of the apparatus, the lower extremity of which spindle Zis provided with an incline, so that when the said spindle is depressed by the operator the upper arm of the lever m, fulcrumed at m, is moved toward the plate 0, the lower arms of such lever being consequently forced in the contrary direction, thereby pushing bevel-wheel is into gear, as already referred to. A front view of the lever m and wheel 7a is shown in Fig. 4..

Springs are shown at e and Z to effect the return of parts k m Z on release. A starwheel it upon the spindle h, controlled by a spring-pawl 7L mounted on the casing, prevents the spindle h being accidentally turned from any ordinary cause, but the power of the said spring-pawl 7L2 may be overcome by the operator on turning the cap t'. The pointers n n are connected to their respective shafts d e, but the pointers 0 0 are respec- 9o tively mounted upon sleeves p p, riding loosely upon the said shafts d e, which sleeves receive a reduced rate of motion from such shafts by means of ordinary gearing 1' 1'', respectively, and imparta further reduced rate 5 of motion to the pointers s .5" through the gearing t t.

The operation is as follows: Supposing the calculation to commence at zero, the spindle Z is depressed to place wheel it into gear with wheel g. The cap t is then turned and the whole gearing is set in motion, all the pointers being moved until the desired figures 'formingthe first item are indicated equally upon both sets of dials. The spindle Z is then released, whereby shaft 0, together with its train, is disconnected. The spindle h is then turned, so as to bring back to zero all the itenrindi attn-s n 0 a, the pointers n. 0 .9 re maining stationary. On the succeeding operation, which is an exact repetition of the foregoing, while the second item is simplyindieated, as before, by the pointers a o the indicators 72 0 s will show a result equivalent to the sum of the two items, having traveled over the combined distances of the two forward movements without having been set baclt. In like manner further additions may be effected, and it will be readily understood that by actuating the mechanism in a contrary direction items may be subtracted when desired. In this latter case it may be preterable to marl; the item-indicating dial with double sets of figures progressing in contrary directions, so that minus and plus indications may be obtained with equal readiness.

It will be obvious that by multiplying the mechanism described a greater number of indicating-dials than are shown may in like manner he applied to one apparatus.

Having now particularly described and ascertained the nature of our said invention and in what manner the same is to be performed, we declare that what We claim is 1. In a portablecalculatingapparatus, item and result indicating mechanisms in two detached portions, capable of effecting addition orsubtraction at the will of the operator, and capable of being coupled together in operation, or of being disconnected to permit of the item portion being set back to zero: the said item portion com prising pointers, gearing opcrating same, and a hand actuating spindle or stem permanently in connection with such gearing, and capable of operating the same in either direction: the said result-indicating mechanism comprising pointers, gearing operating same, a movable clutch-wheel in connection with such gearing, a coupling-spindle operated from the exterior of the appara tus by hand, and connections actuated by such spindle, whereby said clutch may be Forced into or out of communication with the actuating-stem aforesaid, such stem being thereby capable of simultaneously operating both sets of pointers in either direction, or of actuating'the item-pointers alone, substantially as herein setforth.

2. In a portable calculating apparatus,-itemindieat ingpointers n, o, s, gear-wheels 7', Z, and shaft (1, operating same, bevel-wheel factuating said shaft, bevel-wheel g, gearing with wheel f, and hand-spindle Zt, operating wheel. g; in combination with resultindicating pointers a, 0 s, gear-wheels t", Z, and shaft 6, operating same, movab e clutch-wheel Zz, actuating said shaft 0, the movable clutchwheel being capable of operationthrough bevel-wheel g, and spindle 7L, or of disconnection therefrom, lever m acting on said clutchwheel, and spindle Z, operating said lever, for the purpose and in manner substantially as herein set forth.

In a portable calculating apparatus, pointersn, a, on shafts (Z, c, pointers 0, 0, on sleeves p, p; riding upon such shafts, and pointers s, 3; said shafts (Z, a, and sleeves 13,13; gearingf, g, Z:, r, r, and t, Z, operating said pointers, spindle 71 rotated by hand, and actuating said gearing: in combinatimi with spring 0, and lever in, acting on clutchwheel Z2, and spindle Z, depressed by hand to connect wheels is, and o, for the purpose and in manner sul'tstantially as herein set forth.

FRANCIS ALAN .VILKINSON. CLAUD OAREW GIBSON.

\Vitnesses:

G. L. WARREN, l/VALTER J. SKERTEN. 

